Quick question: How do you arrive at 2100 or 1600 for the speed of DDR RAM?

[Jittles]

Title says it all. Just wondering how to get from 100/200 or 133/266 to 1600 or 2100.

 

[Atlantean]

because the ram is ddr ram it means that it is double data rate for transfer, the 2100 is 2.1 gb per second, and the 1600 means 1.6 gb per second

 

[Jittles]

Thanks

Just couldn't figure out the numbers.

 

[Atlantean]

no problem glad to help, but if you are buying ddr ram, remember that it is 184 pin and not 168 like regular ram

 

[Noriaki]

You take Rambus's PC800 number, and have to beat it, throw in a little marketting, and bam! PC1600/2100

No seriously though the PCxxxx rating on DDR SDRAM is it's peak bandwidth like Atlantean said.

PC2100 is DDR266, or a 133Mhz clock.
PC1600 is DDR200, or a 100Mhz clock.

 

[Sugadaddy]

PC2100: 266MHZ x (64bit/8 bits per byte) = 2128 MB/s bandwdith

PC1600: 200MHZ x (64bits/8 bits per byte) = 1600 MB/s bandwidth

PC800 rambus: 800MHZ x (16bits/8 bits per byte) = 1600 MB/s bandwidth

etc...